There was a psa thread a few weeks ago with a deal for a pair from germany for £65 ish. The proper ones, pacestar/trailstar combo. Think it was bike-components.de. I've been running them, seem pretty nice. Large volume, pretty draggy but not excessively so and decent grip. They seem to let go quite easily but slide predictably so good for feeling like a riding boss.

I've got the trail star / pace star combo from bike-discount.de
Very impressed so far, inflated tubeless easily using a track pump. Haven't found the grip limit yet and once off road they don't seem that draggy.
Had 2.25 advantage / crossmarks combo before, wouldn't blow up tubeless without C02, would burp (standard not TR) and the crossmark really wasn't any faster on anything but smooth trails.
Haven't used in thick mud yet and probably wont.

Just got a set of 26" 2.3 Trailstars and am impressed so far. I usually run my tires tubeless, but am running these with tubes on my backup wheels while my main wheels are in the shop. I am able to run crazy low pressures, 20F and 22.5R.